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Originally Posted by XFS03
Yep...I understand the reasons for negative video modulation, but the point I was trying to make is that even "standards" can be incompatable.
The PAL "standard" has different variants. A typical British TV would not work properly in (say) Germany, even though both countries use the PAL system, since the UK uses PAL I and Germany uses PAL B,G.
I think even NTSC & SECAM have variants too, although not as many as PAL.
As for the French, I believe they insisted on being different to try & protect their domestic TV manufacturing industries. I wonder if it worked?
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I think the main differences in the variations on PAL are the mono sound carrier frequency, you will get pictures but no sound!
I have heard that not many if any companies make any SECAM equipment for studio/editting so the processing is mainly PAL and then the output is converted for transmission. Not sure if thats true tho!!